Oil well integrated control device

Abstract

The invention belongs to the field of oil exploitation control and relates to an oil well integrated control device. The device comprises a frequency conversion circuit used for controlling a pumping unit motor and an intermediate-frequency circuit used for heating a sucker rod, wherein the intermediate-frequency circuit and the frequency conversion circuit are controlled by a Z-R control unit to realize a feedback way of a feedback electric energy which is produced by the pumping unit motor; the intermediate-frequency circuit and the frequency conversion circuit share a set of rectifying circuit and filter circuit; the device also comprises a control command center; the control command center receives a voltage or fault signal from the frequency conversion circuit and the intermediate-frequency circuit, sends an instruction to the Z-R control unit according to a voltage or fault type, and controls the Z-R control unit to change the feedback way of the feedback electric energy; the feedback way comprises a power grid which supplies power to the sucker rod by the intermediate-frequency circuit and returns power frequency by the frequency conversion circuit. Electric energy needed by intermediate-frequency heating can be obtained from the power grid, and regenerative electric energy of a pumping unit can be obtained and used for heating the hollow sucker rod.

Description

Technical field [0001] The invention belongs to the field of oil exploitation control, and in particular relates to an integrated oil well control device. Background technique [0002] In Liaohe Oilfield, heavy oil wells account for a large proportion of oil production. The crude oil of this type of well has high viscosity, high freezing point, high density and high wax content, making it difficult to extract. The exploitation of this type of oil well generally requires two types of electrical equipment. One is that the frequency converter supplies power and speed to the pumping unit motor. The function of the pumping unit is to lift crude oil from the ground through the hollow sucker rod. The other is to heat the hollow sucker rods, that is, the "heavy oil thermal recovery" process commonly used in China, which uses industrial frequency or intermediate frequency power to supply power and heat to the hollow sucker rods to make the heavy oil lifted up. , Can realize the smooth e...

AI Technical Summary

Problems solved by technology

[0003] The existing problems are as follows: 1. When the pumping unit is in normal operation, the sucker rod is always in the up and down reciprocating motion. When the sucker rod moves down for half a cycle, due to the difference between the kinetic energy of the sucker rod and the potential energy of the balance block, it will There is a phenomenon that the rotational speed of the motor being dragged exceeds the synchronous speed. At this time, the motor becomes a generator, and the AC power generated by it is converted into DC power through its own inverter (acting as a rectifier at this time). How to deal with this part of the power? At present, there are two ways: one is to add a feedback device to convert this part of DC power into AC power and return it to the power line. Because it has not been treated, it will pollute the power grid.

[0004] 2. The system that supplies power to the pumping unit by the frequency converter and can regulate the speed of the motor, due to the long-term operation of the process, the harsh operating conditions and environment, and the fragile electronic components, often causes shutdowns and no backup The loop is available, affecting normal production

[0005] 3. The method of heating the hollow sucker rod has gone through two stages: one is to use power frequency single-phase power supply for heating, because it consumes a lot of power, has low efficiency, and can cause power frequency three-phase imbalance, so it is quickly used give up

The second is to use a single-function intermediate frequency power supply for heating, which overcomes the above shortcomings and uses the skin effect of intermediate frequency heating to improve operating efficiency, but it still cannot bring the comprehensive index of heating efficiency and energy saving effect to the best state.

[0006] 4. The frequency converter and the intermediate frequency heating power supply have something in common in terms of the functions of the electronic unit components, but they have not formed an organic connection, and their respective potentials cannot be fully utilized, which makes the oil well use electricity The overall performance of the

Images